EP1808867B1 - Fluorierte Zusammensetzung, die thermisch stabil ist - Google Patents

Fluorierte Zusammensetzung, die thermisch stabil ist Download PDF

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Publication number
EP1808867B1
EP1808867B1 EP06301243A EP06301243A EP1808867B1 EP 1808867 B1 EP1808867 B1 EP 1808867B1 EP 06301243 A EP06301243 A EP 06301243A EP 06301243 A EP06301243 A EP 06301243A EP 1808867 B1 EP1808867 B1 EP 1808867B1
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EP
European Patent Office
Prior art keywords
composition
copolymer
fluorinated
electric conductor
titanium dioxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP06301243A
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English (en)
French (fr)
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EP1808867A1 (de
Inventor
Jérôme Alric
Olivier Pinto
Lawrence Letch
Gilberto Lunardi
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Nexans SA
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Nexans SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame

Definitions

  • the present invention relates to an electrical conductor coated with such an extruded, thermally stable composition.
  • this composition is used to isolate part of the cables of category 5, 5e, 6 and 6e, in particular the white part of these cables.
  • these cables are formed by the assembly of four twisted pairs, where each twisted pair comprises a copper wire insulated with a white-colored insulator associated with a copper wire insulated with a colored insulator.
  • the document WO01 / 80253 proposes a high-speed extruded electrical cable insulation mixture composed of a pigmented fluoropolymer.
  • the pigment used is titanium oxide coated with at least one layer of silicone and aluminum oxides.
  • this composition does not provide acceptable thermal stability during the extrusion step.
  • the thermal degradation generated by this step results in an imperfect surface appearance and a non-homogeneous internal structure of the insulation.
  • the sheath thus formed has insulation defects with risks of electrical malfunctions and areas of blackening or discoloration.
  • the invention aims to solve the problems of the prior art by proposing a fluorinated composition, having improved thermal stability, in particular, during the thermal transformation steps of the composition, making it possible to obtain an insulating material free from any defect in the composition. insulation.
  • the thermal degradation of the polymer during the extrusion process is significantly limited.
  • the preferred filler is zinc oxide.
  • Zinc oxide is the most suitable scavenger for neutralizing hydrofluoric acid, especially during reactions taking place at high temperature such as the extrusion steps of fluoropolymers.
  • the concentration of the filler is less than 5% by weight of the composition, and preferably less than 2%.
  • the concentration of the titanium dioxide is less than 30% by weight of the composition, and preferably between 5% and 15%. Said concentrations of the filler and titanium dioxide thus limit the changes in the rheological properties of the fluorinated composition.
  • the fluoropolymer is a fluorinated ethylene propylene (FEP) copolymer.
  • the FEP is chosen from the tetrafluoroethylene / hexafluoroisopropene copolymer or the tetrafluoroethylene / hexafluoroisopropene / perfluoroalkylvinylether copolymer. This type of copolymer is most commonly used in the isolation of twisted pairs of LAN cables.
  • the invention relates to an electrical conductor coated with at least one insulating layer, said layer being obtained from the composition according to the invention.
  • the advantage of such an insulator is to obtain a homogeneous protection of the entire electrical conductor to avoid, for example, electrical breakdowns and to have a uniform appearance uncolored.
  • the figure 1 represents a comparison of the thermal stability of extruded fluorinated compositions according to the invention and according to the prior art.
  • the fluoropolymers undergo different stresses, in particular shear stresses and thermal stresses, with a temperature profile varying between 250 ° C. and 400 ° C.
  • Titanium dioxide is used to whiten some of the cable sheaths for data transmission, including LAN cables.
  • Titanium dioxide is the most used white pigment in the coloring of plastics because of its coloring power higher than other white pigments such as zinc sulphide or lithopone white.
  • titanium dioxide There are two types of titanium dioxide: rutile mesh and anatase mesh. In the case of coloring plastics, the commonly used grades are rutile type, because of their better durability.
  • titanium dioxide in the fluorinated compositions, reacts with the hydrofluoric acid released during the extrusion phase to form titanium tetrafluoride.
  • titanium dioxide when the titanium dioxide is covered with alumina in order to improve its dispersion in the plastic material, another metal halide is formed in the presence of hydrofluoric acid such as aluminum trifluoride.
  • these metal halides will accelerate the chain splitting reactions and thus accelerate the thermal degradation process of the extruded fluorinated composition.
  • the sheath obtained undergoes an irreversible degradation of its chemical structure, translated by the appearance of microbubbles, by the formation of aggregates and, ultimately, by the blackening of the initially white sheath.
  • the invention therefore aims to limit the thermal degradation process of the extrudable compositions based on fluorinated polymer and comprising titanium dioxide.
  • the invention proposes the addition in said composition of an inorganic filler, capable of neutralizing the acid formed during the extrusion step of the composition, having an average particle size of less than 100 nm, and of preferably less than 60 nm.
  • This average size of particles makes it possible to obtain an effective action on the stabilization process of pigmented fluorinated compositions. Indeed, the smaller the average particle size, the greater the specific surface area of the filler, since the specific surface area is inversely proportional to the average particle size. It is necessary so that a maximum surface of the load is in contact with said composition.
  • Said filler is a solid material which does not interact chemically with the polymer matrix and is intended to neutralize the hydrofluoric acid as it is formed.
  • the insulating material thus formed is homogeneous in its chemical structure and presents no insulation defects or aggregates.
  • the white color of the insulation is persistent and no trace of blackening is visible on its surface.
  • the inorganic, acid scavenger is zinc oxide.
  • zinc oxide is the most thermally stable filler.
  • Zinc oxide is thus particularly suitable for the stabilization of systems whose processing temperatures are high, particularly in the case of the extrusion step of fluoropolymers.
  • the composition comprises nanometric zinc oxide, the average particle size of which is between 35 and 55 nm.
  • the filler is selected from dehydrated alkaline fillers such as magnesium oxide or calcium oxide.
  • the composition comprises nanoscale magnesium oxide or nanoscale calcium oxide, the average particle size of which is approximately 30 or 40 nm, respectively.
  • the concentration of the filler is less than 5% by weight of the composition, and preferably less than 2%.
  • the concentration of the titanium dioxide is less than 30% by weight of the composition, and preferably between 5% and 15%.
  • the concentration of the pigment in the extruded fluorinated composition and the dilution of this composition in a virgin fluorine resin during the insulation phase of an electrical conductor, in particular a copper wire, are the two parameters that govern the coloring. final insulation.
  • the concentration of the pigment is greater than 30%, problems of rheology appear: the quality of the dispersion of the pigment in the fluorinated composition is impaired by the formation of aggregates and agglomerates of pigments. This results in a final non-homogeneous coloration of the insulation.
  • concentration of the pigment is less than 5%, a much larger proportion of extruded fluorinated composition should be used in addition to the virgin fluorine resin.
  • the fluorinated polymer may be chosen in particular from tetrafluoroethylene copolymers such as fluorinated ethylene propylene copolymer (FEP), ethylene tetrafluoroethylene (ETFE) copolymer, ethylene and fluorinated ethylene-propylene terpolymer ( DAIKIN EFEP or DYNEON HTE), copolymer of tetrafluoroethylene and perfluoromethylvinylether (MFA) and copolymer of tetrafluoroethylene and perfluoropropylvinylether (PFA), as well as homopolymers, copolymers and terpolymers containing vinylidene fluoride (PVDF, THV).
  • FEP fluorinated ethylene propylene copolymer
  • ETFE ethylene tetrafluoroethylene
  • DAIKIN EFEP or DYNEON HTE fluorinated ethylene-propylene terpolymer
  • the composition comprises a fluorinated ethylene propylene (FEP) copolymer, especially tetrafluoroethylene (TFE) / hexafluoroisopropene (HFP) copolymer.
  • FEP fluorinated ethylene propylene
  • TFE tetrafluoroethylene
  • HFP hexafluoroisopropene
  • Modified FEP copolymers can also be used.
  • the modification is made by the addition, in a minor amount, of a third monomer during the synthesis of the modified FEPs, which may be a perfluoroalkylvinyl ether (PAVE) monomer of the perfluoropropylvinyl ether (PPVE) or perfluoroethylvinyl ether (PEVE) type. .
  • PAVE perfluoroalkylvinyl ether
  • PPVE perfluoropropylvinyl ether
  • PEVE perfluoroethylvinyl ether
  • the main but non-limiting application of the invention lies in the field of data transmission cables. It concerns, in fact, electrical conductors coated with at least one insulating layer obtained from the composition according to the invention.
  • the stability of the material can be evaluated in two ways. The first is to follow the evolution of the Newtonian viscosity of the fluorinated composition at different stages of thermal degradation: the composition having the lowest viscosity drop as a function of the treatment time is the most thermally stable. The second analysis consists in progressively comparing the evolution of the white color of the composition towards a gray discoloration, consequence of its thermal degradation.
  • Samples were prepared by mixing the FEP resin, pigments and fillers with a Berstorff Corotative Bi-Vis extruder.
  • the inorganic filler used is nanometric zinc oxide, the average particle size of which is between 35 and 55 nm and whose specific surface area is of the order of 20-30 m 2 / g.
  • Table 1 gives the compositions of the samples of the various mixtures studied in the context of the invention.
  • the extruded fluorinated composition is then cooled in a tray of water, then dried and granulated.
  • Sample A was aged according to the procedure described above and has the highest thermal stability among the samples tested in the study.
  • Sample B was aged according to the procedure described above. Its thermal stability decreases by 4.1% compared to that of the standard sample A.
  • Sample C was prepared according to the procedure described above by mixing the TFE / HFP / PAVE copolymer with 15% by weight of TiO 2 .
  • the capillary rheometry analysis of the sample shows that the thermal stability drops by 22.6% compared to the standard sample A.
  • Sample D was prepared according to the procedure described above by mixing the TFE / HFP / PAVE copolymer with 14.8% by weight of TiO 2 and 0.2% by weight of nanometric ZnO, the average particle size of which is between 0.035 and 0.055 ⁇ m.
  • the capillary rheometry analysis of the sample shows that the thermal stability drops by 19.1% compared to the standard sample A.
  • Sample E was prepared according to the procedure described above by mixing the TFE / HFP / PAVE copolymer with 14% by weight of TiO 2 and 1% by weight of nanometric ZnO, the average particle size of which is between 0.035 and 0.055 ⁇ m.
  • the capillary rheometry analysis of the sample shows that the thermal stability drops by 13.7% compared to the standard sample A.
  • sample D The presence of 0.2% of nanometric ZnO (sample D) and 1% of nanometric ZnO (sample E) makes it possible to improve the thermal stability of the mixture by 4.2% and 10.3%, respectively, compared to sample C.
  • a second simple and effective means, not shown, for evaluating the thermal stability of extruded fluorinated compositions is to observe the evolution of the discoloration of the material, in particular its blackening, as a function of the thermal aging time at 400 ° C.
  • sample C begins to darken after 5 minutes in the sleeve of the capillary rheometer.
  • samples D and E having undergone the same type of thermal aging, begin to be discolored only after 10 minutes in the sleeve of the capillary rheometer.
  • fillers such as synthetic hydrocalcites or hydrocalumites can also be used.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Organic Insulating Materials (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Inorganic Insulating Materials (AREA)

Claims (5)

  1. Elektrischer Leiter, der von mindestens einer Isolationsschicht ummantelt ist, dadurch gekennzeichnet, dass die Schicht aus einer extrudierbaren, thermisch stabilen Zusammensetzung hergestellt ist, die umfasst:
    - ein Fluorpolymer,
    - ein Titandioxid und
    - eine anorganische, sogenannte säurefangende Charge, die imstande ist, die während des Schritts der Extrusion der Zusammensetzung gebildete Fluorwasserstoffsäure zu neutralisieren, wobei die anorganische Charge aus dem nanometrischen Zinkoxid, dem nanometrischen Magnesiumoxid oder dem nanometrischen Kalziumoxid ausgewählt ist.
  2. Elektrischer Leiter nach Anspruch 1, dadurch gekennzeichnet, dass die Konzentration des Titandioxids unter 30 Gew.-% der Zusammensetzung ist, und vorzugsweise zwischen 5 % und 15 % inklusive.
  3. Elektrischer Leiter nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Konzentration der anorganischen Charge unter 5 Gew.-% der Zusammensetzung ist, und vorzugsweise unter 2 %.
  4. Elektrischer Leiter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Fluorpolymer ein fluoriertes Ethylen-Propylen-Copolymer (FEP) ist.
  5. Elektrischer Leiter nach Anspruch 4, dadurch gekennzeichnet, dass das FEP aus dem Tetrafluorethylen- / Hexafluorisopropen-Copolymer oder dem Tetrafluorethylen- / Hexafluorisopropen- / Perfluoralkylvinylether-Copolymer ausgewählt ist.
EP06301243A 2006-01-12 2006-12-12 Fluorierte Zusammensetzung, die thermisch stabil ist Not-in-force EP1808867B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0650112A FR2895990B1 (fr) 2006-01-12 2006-01-12 Composition fluoree thermiquement stable

Publications (2)

Publication Number Publication Date
EP1808867A1 EP1808867A1 (de) 2007-07-18
EP1808867B1 true EP1808867B1 (de) 2011-04-13

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EP06301243A Not-in-force EP1808867B1 (de) 2006-01-12 2006-12-12 Fluorierte Zusammensetzung, die thermisch stabil ist

Country Status (8)

Country Link
US (1) US20070203281A1 (de)
EP (1) EP1808867B1 (de)
KR (1) KR20070075285A (de)
CN (1) CN101003654A (de)
AT (1) ATE505796T1 (de)
CA (1) CA2573187C (de)
DE (1) DE602006021272D1 (de)
FR (1) FR2895990B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX2009008301A (es) 2007-08-03 2009-09-18 Charles Glew Composiciones para formulacion, extrusion y procesamiento de fusion de fluoropolimeros espumables y celulares.
KR100937226B1 (ko) * 2008-01-14 2010-01-15 한국생산기술연구원 산화칼슘이 첨가되어 제조된 마그네슘 합금의 반용융 압출 방법
CN101970142B (zh) 2008-01-14 2014-05-28 韩国生产技术研究院 触变挤压模制装置及触变挤压模制方法
US10031301B2 (en) * 2014-11-07 2018-07-24 Cable Components Group, Llc Compositions for compounding, extrusion, and melt processing of foamable and cellular polymers
US10032542B2 (en) 2014-11-07 2018-07-24 Cable Components Group, Llc Compositions for compounding, extrusion and melt processing of foamable and cellular halogen-free polymers
US9728298B2 (en) 2015-06-26 2017-08-08 Daikin America, Inc. Radiation crosslinked fluoropolymer compositions containing low level of extractable fluorides

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0789049A1 (de) * 1996-02-09 1997-08-13 Ciba SC Holding AG Antistatisch ausgerüstete Polymere
US5916937A (en) * 1997-09-30 1999-06-29 General Electric Company Heat cured fluorosilicone rubber compositions having improved compression set
WO2001080253A1 (en) * 2000-04-13 2001-10-25 E.I. Dupont De Nemours And Company Process for coating wire conductor
DE602005013911D1 (de) * 2004-01-23 2009-05-28 Du Pont Gefüllte perfluorpolymere

Also Published As

Publication number Publication date
CA2573187A1 (en) 2007-07-12
FR2895990A1 (fr) 2007-07-13
CA2573187C (en) 2014-06-03
FR2895990B1 (fr) 2008-02-15
CN101003654A (zh) 2007-07-25
DE602006021272D1 (de) 2011-05-26
ATE505796T1 (de) 2011-04-15
KR20070075285A (ko) 2007-07-18
EP1808867A1 (de) 2007-07-18
US20070203281A1 (en) 2007-08-30

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